| # - Check if _FILE_OFFSET_BITS macro needed for large files |
| # CHECK_FILE_OFFSET_BITS () |
| # |
| # The following variables may be set before calling this macro to |
| # modify the way the check is run: |
| # |
| # CMAKE_REQUIRED_FLAGS = string of compile command line flags |
| # CMAKE_REQUIRED_DEFINITIONS = list of macros to define (-DFOO=bar) |
| # CMAKE_REQUIRED_INCLUDES = list of include directories |
| # Copyright (c) 2009, Michihiro NAKAJIMA |
| # |
| # Redistribution and use is allowed according to the terms of the BSD license. |
| # For details see the accompanying COPYING-CMAKE-SCRIPTS file. |
| |
| #INCLUDE(CheckCXXSourceCompiles) |
| |
| GET_FILENAME_COMPONENT(_selfdir_CheckFileOffsetBits |
| "${CMAKE_CURRENT_LIST_FILE}" PATH) |
| |
| MACRO (CHECK_FILE_OFFSET_BITS) |
| IF(NOT DEFINED _FILE_OFFSET_BITS) |
| MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files") |
| TRY_COMPILE(__WITHOUT_FILE_OFFSET_BITS_64 |
| ${CMAKE_CURRENT_BINARY_DIR} |
| ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c |
| COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS}) |
| IF(NOT __WITHOUT_FILE_OFFSET_BITS_64) |
| TRY_COMPILE(__WITH_FILE_OFFSET_BITS_64 |
| ${CMAKE_CURRENT_BINARY_DIR} |
| ${_selfdir_CheckFileOffsetBits}/CheckFileOffsetBits.c |
| COMPILE_DEFINITIONS ${CMAKE_REQUIRED_DEFINITIONS} -D_FILE_OFFSET_BITS=64) |
| ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64) |
| |
| IF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) |
| SET(_FILE_OFFSET_BITS 64 CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") |
| MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - needed") |
| ELSE(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) |
| SET(_FILE_OFFSET_BITS "" CACHE INTERNAL "_FILE_OFFSET_BITS macro needed for large files") |
| MESSAGE(STATUS "Cheking _FILE_OFFSET_BITS for large files - not needed") |
| ENDIF(NOT __WITHOUT_FILE_OFFSET_BITS_64 AND __WITH_FILE_OFFSET_BITS_64) |
| ENDIF(NOT DEFINED _FILE_OFFSET_BITS) |
| |
| ENDMACRO (CHECK_FILE_OFFSET_BITS) |
| |